Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/003—Marking, e.g. coloration by addition of pigments
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/22—Organic compounds containing nitrogen
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/22—Organic compounds containing nitrogen
  • C10L1/226—Organic compounds containing nitrogen containing at least one nitrogen-to-nitrogen bond, e.g. azo compounds, azides, hydrazines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/22—Organic compounds containing nitrogen
  • C10L1/23—Organic compounds containing nitrogen containing at least one nitrogen-to-oxygen bond, e.g. nitro-compounds, nitrates, nitrites
  • C10L1/231—Organic compounds containing nitrogen containing at least one nitrogen-to-oxygen bond, e.g. nitro-compounds, nitrates, nitrites nitro compounds; nitrates; nitrites
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/10—Liquid carbonaceous fuels containing additives
  • C10L1/14—Organic compounds
  • C10L1/22—Organic compounds containing nitrogen
  • C10L1/232—Organic compounds containing nitrogen containing nitrogen in a heterocyclic ring
  • C10L1/233—Organic compounds containing nitrogen containing nitrogen in a heterocyclic ring containing nitrogen and oxygen in the ring, e.g. oxazoles
  • C10L1/2335—Organic compounds containing nitrogen containing nitrogen in a heterocyclic ring containing nitrogen and oxygen in the ring, e.g. oxazoles morpholino, and derivatives thereof

Definitions

• the present invention is directed to the tagging of petroleum fuels with silent markers and to detection of such markers in petroleum fuels.
• a dye is defined herein as a material lending visible color when dissolved in the dyed fuel.
• Examples of dyes which have been used for dyeing organic liquids are Color Index Solvent Red #24, Solvent Red #19, Solvent Yellow #14, Solvent Blue #36, and Solvent Green #3.
• a marker is defined herein as a substance which can be dissolved in a liquid to be identified, then subsequently detected by performing a simple chemical or physical test on the tagged liquid. Markers that have been proposed, or are in use, include furfural, quinizarin, diphenylamine and radioactive materials. (Radioactive materials have not been accepted in Western countries because of special equipment and precautionary measures associated with their handling.)
• Dyes and markers are needed to clearly distinguish chemically or physically similar liquids.
• fuels are dyed or tagged to provide visually distinctive brand and grade denominations for commercial and safety reasons.
• some lightly taxed fuels are dyed or tagged to distinguish them from similar materials subject to higher taxes.
• certain fuels are dyed or tagged to deter fraudulent adulteration of premium grade fuels with lower grade fuels, such as by blending kerosene, stove oil, or diesel fuel into regular grade gasoline or blending regular grade gasoline into premium grade gasoline.
• Identification of particular batches of bulk liquids for protection against theft is another valuable function of markers and dyes, particularly for identifying fuels owned by large government, military or commercial consumers.
• marketers of brand name fuels dye or tag their fuels to detect substitution of others' fuels in their distribution system.
• Dyes alone are not always adequate to securely and reliably identify liquids. Many dyes are easily removed by unauthorized persons. Furthermore, dyes can be obscured by other natural or added substances (particularly dyes present at low concentrations in a mixture of fuels). Because dyes alone have these shortcomings, a combination of a dye and a marker often is used to tag an organic liquid.
• the dyes of the present invention fulfil requirements of 1-6 above.
• the markers of the present invention are "silent" in that at the levels at which they are used, they provide substantially no color to the petroleum fuel, but undergo a reaction during a detection procedure.
• the silent nature of the markers of the present invention make them particularly suitable as markers in non-dyed petroleum fuels, but they are suitable in dyed petroleum fuels, as well, where the markers do not alter the color imparted by the dyes.
• the silent nature of the markers of the present invention also is advantageous in that they cannot be detected without an appropriate reactive extraction system, making misuse or dilution of a petroleum fuel mixed with a marker of the present invention more difficult.
• a suitable petroleum marker that is to be extracted by a petroleum-immiscible solution must meet somewhat demanding solubility requirements.
• the marker is only present in the petroleum fuel in parts-per-million quantities, but the marker is desirably provided to the petroleum in concentrated form, either in a petroleum fuel or in a petroleum-miscible solvent.
• a small amount of extractant should remove substantially all of the marker from the specimen of petroleum fuel being tested.
• the markers of the present invention are detectable by extraction from the petroleum fuel with a dilute acidic solution, e.g., a 10% HCl or formic acid solution. It is desirable that acid-extractable markers be available, particularly markers which develop a color sufficiently strong to be clearly differentiated from any background color which might develop from acid reaction with petroleum impurities or develop a color which is sufficiently different from any such background color.
• Acid-extractable markers in use today suffer significantly from the fact that they require the use of concentrated mineral acids to extract, resulting in very significant interference from extracted background color.
• acid-extractable markers increases the variety of materials with which petroleum might be marked. As most present day markers are base-extractable, someone intent on mislabeling petroleum fuel might first check for marker by extraction with base, thereby missing an acid-extractable marker. Also, acid-extractable markers may provide for a double marking system, including both the acid-extractable marker and a base-extractable marker. Likewise, the impermissible mixing of two petroleum fuels each tagged with base-extractable markers might be missed, particularly if the developed marker colors is similar; whereas, impermissible mixing a petroleum fuel tagged with an acid-extractable marker and a petroleum fuel tagged with a base-extractable marker can be detected by subsequent extractions with acid and base.
• Markers of the present invention are also advantageous in that they provide relatively quantitative determinations. Most markers are adequate for detection of their presence in petroleum fuel; however, many available markers, especially acid-extractable markers, do not provide a good quantitative measurement of their levels in liquid petroleum fuels. Quantitative determinations are particularly important in cases where dilution is suspected, e.g., dilution of a higher-taxed fuel with a lower-taxed fuel.
• liquid petroleum fuels are tagged with a marker of the formula: where R1 and R2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R3 is selected from methyl, methoxy, methoxyethoxy and morpholino.
• Markers at levels of about 0.25 parts per million (ppm) or above (usually at least about 1 ppm) are added to liquid petroleum fuels.
• the markers may be detected in the petroleum fuels by extraction with an acidic aqueous solution. This acidic aqueous solution not only extracts the marker from the liquid petroleum fuel, but causes the marker to react, producing a clearly defined color that identifies the petroleum fuel as to source, permitted use, etc.
• the present invention further provides novel compounds particularly suitable as markers for petroleum fuels.
• Markers of the present invention are conveniently synthesized by azo coupling of an appropriately substituted aniline to an alpha-naphthylamine.
• Compounds of the above general formula are generally colorless or have a pale yellow color which at the end use levels, e.g., 0.25-100 ppm.
• the resulting amine salt is a rich color.
• R1, R2 and R3 may be varied to achieve different development colors and to adjust solubility.
• the compounds are soluble to at least 10% in a high boiling aromatic solvent. (By high boiling is meant having a boiling point of about 200°C or above.)
• Some compounds in accordance with the invention have solubilities in high boiling aromatic solvent of 40 to 60%, enabling a very concentrated marker solution to be provided.
• the final amount of marker in the tagged liquid petroleum fuel will depend upon a variety of factors. It is generally necessary to have at least about 0.25 ppm in the finally tagged liquid petroleum fuel. Usually, however, a somewhat greater amount will be provided, e.g., 5-40 ppm, enabling the marker to be detected, should the tagged petroleum fuel be diluted with non-tagged petroleum fuel. It is generally desirable to provide an amount of marker that might be detected in a simple field test. Of course, where sophisticated testing equipment is available, it may be possible to use even less marker.
• Extraction of the marker from the tagged petroleum fuel may conveniently be carried out with a dilute, e.g., 10-30%, aqueous solution of an acid, such as HCl, formic acid, and phosporic acid.
• the extraction solution may also includes a water- miscible, petroleum-immiscible organic solvent, such as methanol.
• the acid forms a salt with the secondary amine group, resulting in development of the color and also changing the solubility of the marker so that it is substantially less soluble in petroleum and substantially more soluble in aqueous medium.
• the volume ratio of extraction mixture to liquid petroleum is between about 1:1 and about 1:40. If marker is present in the petroleum fuel, it will be extracted by the aqueous layer and colored by reaction with the extraction mixture. Colorimetric equipment may be used to quantify the amount of marker in the aqueous layer. As long as similar conditions, e.g., volume-to-volume, ratios are used for similar liquid petroleum fuels, the color that is produced is relatively quantitative. The test is not "quantitative" in the strict sense that exact levels of marker can be tested in tagged petroleum. This is due in large part to the nature of petroleum fuels which are mixtures of a wide variety of compounds. Depending upon the particular batch of petroleum fuel, the level of impurities extractable by the extraction solution may vary. However, in tests conducted according to the present invention, it is generally possible to determine marker levels to within about 5%.
• the test is a quick, one-step test. Convenience can be enhanced by providing an inspector a pre-measured amount of extractant solution in an extraction vial and, preferably, means to measure an appropriate amount of petroleum fuel. For a rough estimate of marker level, the inspector might even be provided with a color chart against which to compare the developed color.
• markers were produced as per example 1 but using 2) 47 gm. aniline, 3) 69 gm of p-cresidine, and 4) 1125 gm. amino azo toluene. These markers, when extracted with acid, develop red, blue, and red respectively.

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• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

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• 1994
  • 1994-04-28 US US08/234,201 patent/US5490872A/en not_active Expired - Fee Related
• 1995
  • 1995-02-17 TW TW084101456A patent/TW270142B/zh active
  • 1995-02-23 AU AU13425/95A patent/AU662321B1/en not_active Ceased
  • 1995-03-16 EP EP95301746A patent/EP0679710A1/fr not_active Withdrawn
  • 1995-04-26 JP JP7102049A patent/JP2642081B2/ja not_active Expired - Lifetime
  • 1995-04-27 BR BR9501823A patent/BR9501823A/pt not_active Application Discontinuation

Patent Citations (5)

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